Sukoon.
Android CGM glucose viewer for Type 1 diabetes — Jetpack Compose, interactive time-ranged graphs, built from personal medical need.
A native Android CGM companion app for the FreeStyle Libre 2, built to replace the stock sensor UI with something calmer and more useful. Born from my own daily need as a Type 1 diabetic — the name means “stillness” in Arabic.
Why I built it
Existing CGM apps (Diabox, LibreLink) are cluttered, alarming, and designed around anxiety. Sukoon takes the opposite approach: a still-water/ripple design metaphor, colorblind-safe dual-encoded UI (color + texture), and language that reassures instead of panicking. “Calm and steady” instead of a flashing red number.
Architecture
Clean-layered Kotlin with MVVM: data/ (Room DB, preferences, sensor sources), domain/ (metrics, units), ui/ (Compose components, screens, navigation). Manual DI via AppContainer, ViewModels with UiState mappers, Coroutines/Flow throughout.
Libre protocol — clean-room implementation of the encrypted BLE/NFC protocol (ISO 15693 + key derivation), not forked from any existing open-source reader.
Features
- Real-time glucose graph — hand-rolled Compose Canvas rendering (no chart library), with selectable time ranges (3h/6h/12h/24h)
- MiniGraph sparkline — compact glucose trend at a glance
- Clinical metrics — Time in Range, GMI, SD/CV, GVI, PGS computed in
GlucoseMetrics.kt - Unit support — mg/dL and mmol/L with live conversion
- Insights screen — 14-day trend analysis with plain-language summaries
- SimulatedSource — development mode without a real sensor
- Onboarding — medical disclaimer gate on first launch
Room DB with entities for readings, sensor sessions, calibrations, and events. ~3,400 lines of Kotlin across 32 source files. Early active development — 17 commits, 7 PRs merged, 31 open issues across 5 milestones.